Allow selection on move type to file.

src/Features/Core/Portable/CodeRefactorings/MoveType/AbstractMoveTypeService.State.cs

@@ -19,7 +19,6 @@ private class State
             public string TypeName { get; set; }
             public string DocumentNameWithoutExtension { get; set; }
             public bool IsDocumentNameAValidIdentifier { get; set; }
-            public bool IsSelectionOnTypeHeader { get; set; }
 
             private State(SemanticDocument document)
             {
@@ -28,10 +27,10 @@ private State(SemanticDocument document)
 
             internal static State Generate(
                 SemanticDocument document, TTypeDeclarationSyntax typeDeclaration,
-                bool isSelectionOnTypeHeader, CancellationToken cancellationToken)
+                CancellationToken cancellationToken)
             {
                 var state = new State(document);
-                if (!state.TryInitialize(typeDeclaration, isSelectionOnTypeHeader, cancellationToken))
+                if (!state.TryInitialize(typeDeclaration, cancellationToken))
                 {
                     return null;
                 }
@@ -41,7 +40,6 @@ private State(SemanticDocument document)
 
             private bool TryInitialize(
                 TTypeDeclarationSyntax typeDeclaration,
-                bool isSelectionOnTypeHeader,
                 CancellationToken cancellationToken)
             {
                 if (cancellationToken.IsCancellationRequested)
@@ -65,7 +63,6 @@ private State(SemanticDocument document)
 
                 TypeNode = typeDeclaration;
                 TypeName = typeSymbol.Name;
-                IsSelectionOnTypeHeader = isSelectionOnTypeHeader;
                 DocumentNameWithoutExtension = Path.GetFileNameWithoutExtension(SemanticDocument.Document.Name);
                 IsDocumentNameAValidIdentifier = syntaxFacts.IsValidIdentifier(DocumentNameWithoutExtension);
 

src/Features/Core/Portable/CodeRefactorings/MoveType/AbstractMoveTypeService.cs

@@ -40,7 +40,7 @@ internal abstract partial class AbstractMoveTypeService<TService, TTypeDeclarati
         {
             var state = await CreateStateAsync(document, textSpan, cancellationToken).ConfigureAwait(false);
 
-            if (state == null || !state.IsSelectionOnTypeHeader)
+            if (state == null)
             {
                 return ImmutableArray<CodeAction>.Empty;
             }
@@ -73,24 +73,16 @@ public override async Task<Solution> GetModifiedSolutionAsync(Document document,
 
         private async Task<State> CreateStateAsync(Document document, TextSpan textSpan, CancellationToken cancellationToken)
         {
-            if (!textSpan.IsEmpty)
-            {
-                return null;
-            }
-
             var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
-            var nodeToAnalyze = root.FindToken(textSpan.Start).GetAncestor<TTypeDeclarationSyntax>();
 
+            var nodeToAnalyze = await document.TryGetRelevantNodeAsync<TTypeDeclarationSyntax>(textSpan, cancellationToken).ConfigureAwait(false);
             if (nodeToAnalyze == null)
             {
                 return null;
             }
 
-            var syntaxFacts = document.GetLanguageService<ISyntaxFactsService>();
-            var isOnTypeHeader = syntaxFacts.IsOnTypeHeader(root, textSpan.Start, out _);
-
             var semanticDocument = await SemanticDocument.CreateAsync(document, cancellationToken).ConfigureAwait(false);
-            return State.Generate(semanticDocument, nodeToAnalyze, isOnTypeHeader, cancellationToken);
+            return State.Generate(semanticDocument, nodeToAnalyze, cancellationToken);
         }
 
         private ImmutableArray<CodeAction> CreateActions(State state, CancellationToken cancellationToken)